Operations and control flow

After knowing variable types, let’s start to know more about Python operators, and how you can control the execution flow of your code.

Operations

There is a quite number of operation available in Python

Mathematical operations

Adding

>>> 10 + 1020
>>> 10 + 10.020.0

Subtraction

>>> 10 - 55
>>> 10 - 5.05.0

Multiplication

>>> 10 * 550
>>> 10 * 5.050.0
# Power
>> 2 ** 532

Division

>>> 10 / 3 
3.3333333333333335
>>> 10 // 3
3
# Reminder
>>> 5 % 3
2

Relational operation

>>> Num = 10
>>> Num == 10
True
>>> Num != 10
False
>>> Num < 11
True
>>> Num > 9
True
>>> Num >= 10 
True
>>> Num <= 10 
True

Control flow

If conditions

It is a branch execution based on a value expiration

if True:
    print("It's true")
else:
    pass

Loops

While loop

While loop is a block of code that will be executed while a condition is True, and stops when it becomes False

count = 5
while count != 0:
    print(count)
    count -= 1

You can end a loop on another condition by break keyword

x = 10
while True:
    x -= 1
    if x == 0:
        break

For loop

For loop is a loop for each item in the loop block (iterable object)

>>> names = ["amr", "tarek", "hassan", "abdelghafar"]
>>> for name in names:
...    print(name)
...
amrtarekhassanabdelghafar

Incremental for loop

>>> for i in range(0,3):
...    print(I)
...
012

decrement for loop (reversed)

>>> for i in range(3,0,-1):
...    print(I)
...
321

enumerate

>>> t = [6, 12, 30 , 20]
>>> for i in enumerate(t):
...    print(i)
...
(0, 6)
(1, 12)
(2, 30)
(4, 20)

So now you can start with python modularity and more deep python stuff.